Went to the local gun show this past weekend looking for a Rem. 870 in 20 to make a home defense gun out of but came home instead with a really sweet M77/22 with the smooth barrel and nice walnut stock. Got it home and mounted a nice vintage 3x9x40 Redfield on it and started getting it sighted in. Bore sighted it and then started shooting paper at 25 yards, then 50 and finally out to 100 yards. It was just way too windy to do much fine tuning but yesterday I got it to print a best 3 shot group of right at 1.5 inches with Winchester superX and CCI mini mags. Rem. Yellow jackets looked like a shotgun pattern, terrible. Then after about 30 shots or so it started spraying pretty bad with the good stuff. Could this be attributed to just getting dirty or do you think it might be something else? Checked the mounts and all were snug. Also, I'm shooting about 5 inches or so low at 100, should I adjust for dead on at 100 or at 50? Thanks for any and all help.
